function enter(pi) {
    if (pi.getMap().getAllMonstersThreadsafe().size() == 0) {
	pi.warpParty(pi.getMapId() + 100,0); //next
	pi.openNpc(9071004,"怪物公园判断");
    } else {
	pi.playerMessage(5, "地图上的怪物还没有清理干净！");
    }
}